泡沫混凝土复合墙体材料力学及热物理性能研究(1)

Mechanical and thermophysical properties of composite wall with foamed concrete(1)

研究了PP和PVA纤维对3个密度等级的泡沫混凝土抗压、抗弯性能的影响;同时还研发了纤维水泥板-泡沫混凝土复合墙体形式,并对其力学性能进行了测试和保温节能特性进行数值模拟。结果表明,泡沫混凝土干密度是其抗压强度的主要控制因素,纤维的掺入可提高抗压峰值荷载之后的承载能力,但对抗压强度值影响不大;纤维的掺加不但能大幅提高泡沫混凝土的抗弯强度,同时还使其表现出较好的延性;复合墙体材料整体抗压及抗弯强度较泡沫混凝土材料有了大幅提高。与典型的保温墙体相比,在相同节能效果下,1000、700和500 kg/m33个密度等级复合墙体的厚度分别为470 mm、350 mm和240 mm。

In the present paper, the influence of PP and PVA fibers on compressive and bending performance of foamed con- crete with different density is investigated. Moreover, a new kind of composite wall material with fiber reinforced board and foamed concrete is designed,the mechanical and thermophysical properties of the wall material is investigated by deformation controlled tests and numerical simulation respectively. The results show that density of foamed concrete is the principal factor controlling the strength. Fibers have little influence on the compressive strength,but the improvement on load catty capability after ultimate load is significant. The flexural strength of foamed concrete increases greatly and the ductility is significantly improved as fiber added. The compressive and flexural strength of the composite wall material increases significantly comparing with foamed concrete. Com- pared with a typical insulated wall,the thickness of walls are 470 ram, 350 mm and 240 mm respectively composited of the foamed concrete with density of 1000 kg/m3,700 kg/m3 and 500 kg/m3, for the same energy saving effect.